CVE-2018-16596 Explained : Impact and Mitigation

The LAN UPnP service on UDP port 1900 of Swisscom Internet-Box is vulnerable to a buffer overflow issue, allowing for remote code execution without authentication.

Understanding CVE-2018-16596

This CVE identifies a critical vulnerability in the LAN UPnP service of Swisscom Internet-Box devices, enabling attackers to execute remote code.

What is CVE-2018-16596?

A buffer overflow issue in the LAN UPnP service on UDP port 1900 of Swisscom Internet-Box devices allows remote code execution without the need for authentication. Attackers can exploit this vulnerability by sending a basic UDP packet to port 1900, potentially leading to a denial-of-service (DoS) attack.

The Impact of CVE-2018-16596

Successful exploitation enables remote code execution on the affected device within the LAN.
The vulnerability poses a significant security risk as it allows attackers to execute malicious code without authentication.
Due to Address Space Layout Randomization (ASLR), the attack may result in a DoS of the UPnP service instead of code execution.

Technical Details of CVE-2018-16596

The technical aspects of the vulnerability provide insight into its nature and potential risks.

Vulnerability Description

The buffer overflow issue in the LAN UPnP service on UDP port 1900 of Swisscom Internet-Box devices.
Allows for remote code execution without authentication, posing a severe security threat.

Affected Systems and Versions

Swisscom Internet-Box (2, Standard, and Plus) devices before v09.04.00 and Internet-Box light before v08.05.02.

Exploitation Mechanism

Attackers can exploit the vulnerability by sending a basic UDP packet to port 1900, enabling remote code execution.
Success is not guaranteed due to ASLR, potentially resulting in a DoS of the UPnP service.

Mitigation and Prevention

Protecting systems from CVE-2018-16596 requires immediate actions and long-term security measures.

Immediate Steps to Take

Apply the latest firmware updates provided by Swisscom to patch the vulnerability.
Monitor network traffic for any suspicious activities targeting UDP port 1900.

Long-Term Security Practices

Implement network segmentation to restrict access to critical services like UPnP.
Conduct regular security assessments and penetration testing to identify and address vulnerabilities.

Patching and Updates

Ensure all Swisscom Internet-Box devices are updated to v09.04.00 or later to mitigate the vulnerability.